JPH06168623A - Core composition for roadside communicating coaxial cable - Google Patents

Abstract

PURPOSE:To improve tensile elongation percentage and an attenuation characteristic by using titanate coupling agent. CONSTITUTION:Ferrite at 200 to 1000 part by weight and titanate coupling agent at 0.1 to 100 part by weight are blended with polyvinyl chloride at 100 part by weight to form the core composition for roadside communication coaxial cable. Tensile elongation percentage and flexibility of the core composition are thereby improved. Titanate coupling agent at 0.05 to 10 part by weight, desirably, at 0.1 to 5 part by weight in consideration of tensile elongation percentage and the attenuation characteristic is blended in relative to the ferrite at 100 part by weight. As polyvinyl chloride, a polyvinyl chloride at 500 to 5000 degree of polymerization, desirably, at 1000 to 3000 degree of polymerization is used. This core composition is kneaded by a bunbury mixer, a henschel mixer, a kneader a roll, a blender or the like, and processed into a specified product-form by using a molding machine such as an extruder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core composition for a coaxial cable for roadside communication, which has extremely good flexibility.

[0002]

2. Description of the Related Art Conventionally, as a core composition for a coaxial cable for roadside communication, a mixture of ferrite and polyvinyl chloride has been used, and a polyvinyl chloride composition containing a large amount of ferrite is used from the viewpoint of increasing leakage radio waves. Things were being used. Generally, when a large amount of ferrite is blended in a polyvinyl chloride resin, the flexibility of the composition is impaired, so a plasticizer was added to solve this problem. However, since flexibility of the core composition is not sufficient even if a plasticizer is added, when the core composition is made long by an extruder or the like to form a core member and the core member is used to form a cable. It was not easy to handle the cable or when laying the cable.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a core composition for a coaxial cable for roadside communication which is extremely flexible.

[0004]

[Means for Solving the Problems] The above-mentioned problems are as follows.
This is solved by a core composition for a coaxial cable for roadside communication, characterized by being mixed with 0.1 to 100 parts by weight of a titanate coupling agent.

[0005]

By adding ferrite and a titanate coupling agent to polyvinyl chloride, the tensile elongation can be dramatically improved and a core composition with excellent flexibility can be obtained. Moreover, the damping characteristics are also surprisingly improved.

[0006]

GENERAL DESCRIPTION OF THE INVENTION Next, the materials used in the present invention.
Will be described in detail. In the present invention, titanate type
A coupling agent is essential. Titanate type coupling
Known agents can be used as the anti-aggressive agent. For example isop
Ropyrtriisostearoyl titanate, isopropyl
Trioctanoyl titanate, isopropyl diisostea
Aroyl cumyl phenyl titanate, isopropyl tri
Dodensylbenzene sulfonititanate, tetraisoprene
Ropyrdi (dioctyl phosphite) titanate, iso
Propyl tris (dioctyl pyrophosphate) titane
Bis (dioctylpyrophosphate) oxyacetate
Tate titanate, diisostearoyl oxyacetate
Totitanate, dicumylphenolate oxyacetate
Titanate, di (dioctyl phosphate) ethylene
Tanate, 4-aminobenzenesulfonyl dodecylben
Zensulfonyl ethylene titanate, di (butyl, methyl)
Lupyrophosphate) ethylene titanate and the like.
Be done. The titanate-based coupling agent may be used alone or in combination.
More than one species can be used. For polyvinyl chloride
Blending the ferrite with the titanate coupling agent
It is only necessary to add ferrite to the above titanate series beforehand.
Surface treatment with a coupling agent is preferred. Titan
Method of surface treatment of ferrite with cobalt coupling agent
A known method can be used.

The amount of titanate coupling agent is
The titanate coupling agent is 0.1 to 100 parts by weight with respect to 100 parts by weight of polyvinyl chloride. If it is 0.1 parts by weight or less, the tensile elongation is low, and if it is 100 parts by weight or more, the tensile elongation is low. The preferable blending amount of the titanate coupling agent may be determined in consideration of the blending ratio of ferrite and titanate coupling agent. For example, with respect to 100 parts by weight of ferrite, about 0.05 to 10 parts by weight of a titanate-based coupling agent, and more preferably, from the viewpoint of tensile elongation and damping properties, 100 parts by weight of a ferrite-based coupling agent is used. It is about 1 to 5 parts by weight.

A well-known ferrite can be used as the ferrite. For example, manganese ferrite, nickel ferrite, zinc ferrite, manganese-zinc ferrite, manganese-zinc-iron ferrite, nickel-zinc ferrite, cobalt-iron ferrite, manganese-magnesium-aluminum ferrite, strontium ferrite, barium ferrite, chromium ferrite, calcium. Examples include ferrite and lead ferrite. The above ferrites can be used alone or in combination of two or more. The particle size of these ferrite powders is not particularly limited, but is 0.01 to 100 μm, preferably 0.05 to 50 μm, and more preferably 0.1 to 5 μm.
Is.

The blending amount of the above ferrite is 200 to 1000 parts by weight with respect to 100 parts by weight of polyvinyl chloride. If the amount of ferrite compounded is less than 200 parts by weight, the magnetic properties are poor, and if it is more than 1000 parts by weight, the tensile elongation tends to decrease. It is preferably 500 to 800 parts by weight in terms of tensile elongation and damping characteristics.

As the polyvinyl chloride, known polyvinyl chloride can be used. For example, vinyl chloride is added to vinyl chloride homopolymer, vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-ethylene-vinyl acetate copolymer, vinyl chloride-ethylene-vinyl acetate copolymer. Examples thereof include graft-polymerized vinyl chloride copolymers. The above polyvinyl chloride may be used alone, or two or more kinds of polyvinyl chloride may be used.

Polyvinyl chloride has a degree of polymerization of 500 to
It is 5000, especially 1000 to 3000. Examples of commercially available polyvinyl chloride include Vinica KR800 manufactured by Mitsubishi Monsanto Kasei Co., ZEON RZ250 manufactured by Nippon Zeon Co., SH250 manufactured by Denki Kagaku Kogyo Co., Ltd., and Vinicron HS-L manufactured by Mitsui Toatsu Chemical Co., Ltd.

The composition of the present invention comprises various synthetic rubbers as shown below within the range not impairing the object of the present invention,
A thermoplastic synthetic resin can be mixed and used. For example, as various synthetic rubbers, polybutadiene, polychloroprene, chlorinated polyethylene, chlorinated polypropylene,
Fluorine rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-isoprene-styrene block copolymer, styrene-propylene -Butylene-styrene block copolymer and the like can be mentioned. Further, as the thermoplastic synthetic resin, for example, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer,
Ethylene-propyl acrylate copolymer, polystyrene, styrene-acrylonitrile copolymer, styrene-
Acrylonitrile-butadiene copolymer, polyamide,
Examples thereof include polyethylene terephthalate, polybutylene terephthalate, polycarbonate and fluororesin.

Further, the composition of the present invention contains a plasticizer, a stabilizer and the like which are usually blended with a polyvinyl chloride resin,
You may add the compounding agent as shown below in the range which does not impair the objective of this invention. That is, aluminum hydroxide, hydrates of metal oxides such as magnesium hydroxide, clay, kaolin, magnesium carbonate, montmorillonite,
Zeolites, magnesium carbonate, gypsum, magnesium silicate, silica, various carbon black, fillers such as titanium oxide, hindered phenol-based, quinoline-based, aromatic amine-based antioxidants, red phosphorus, zinc borate, Examples thereof include flame retardant aids such as zinc hydroxystannate, zinc stannate, and antimony oxide, lubricants, and processing aids.

Further, if necessary, dicumyl peroxide, 1,1-bis (t-butylperoxy) 3,3,3
Peroxide such as 5-trimethylcyclohexane, p
An oxime such as quinonedioxyl, p, p'-dibenzoylquinonedioxime, or one of bifunctional crosslinking aids such as N, N'-metaphenylene dimaleimide, trimethylpropane trimethyl acrylate, diacryphthalate or Two or more kinds may be added to 0.1 to 3.0 parts by weight and heat treated.

The core composition of the present invention is used as a core composition of a coaxial cable for roadside communication. Roadside communication coaxial cables are laid on roads, along railway lines, in buildings, in tunnels, etc., and used in systems that radiate radio waves from the cables and transmit information to drivers etc. via receivers such as radios. It is what is done.

The core composition for a coaxial cable for roadside communication of the present invention is kneaded by a conventional kneading means, for example, a Banbury mixer, a Henshur mixer, a kneader, a roll, a blender, etc., and then a molding machine such as an extruder is used. Processed into a specific product shape.

(Embodiments 1 to 5) Next, embodiments of the present invention will be described. 16 compositions of Examples 1-5 shown in Table 1
The mixture was prepared by mixing with two rolls kept at 0 ° C., and the elongation rate, dielectric property, and electric resistance property were examined by the following methods, and the results are shown in the same table. 1) Elongation rate It measured according to the tensile test method of JISK6723 using the 1 mm-thick sheet produced from the composition shown in each Example. 2) Dielectric properties / electrical resistance properties Dielectric constant ε (measurement frequency: 10 KH) at room temperature using a sheet having a thickness of 1 mm prepared from the composition shown in each example.
z), tan δ (measurement frequency 10 KHz), and volume resistivity ρ were measured. Note that the attenuation characteristics are dielectric constant, tan δ,
It is determined by the characteristic of volume resistivity, which is the dielectric constant, t
The smaller the an δ and the larger the volume resistivity, the better.

The compounding material used in the examples is polyvinyl chloride (KR800 manufactured by Mitsubishi Monsanto Kasei Co., polymerization degree 23).
50), plasticizer (DOP manufactured by ADEKA AGAAS CHEMICAL CO., LTD., ADEKA CIZER C-8, TOTM manufactured by Kao Corporation, TRIMEX T)
-08), stabilizer (Pb-based composite stabilizer), titanate-based coupling agent-treated ferrite (BSF5 manufactured by Toda Kogyo Co., Ltd.)
47-A, particle diameter about 3 μm).

(Comparative Examples 1 to 3) Comparative Examples 1 to 3 shown in Table 1
The composition was prepared in the same manner as in the above Example, and the measurement results are shown in the same table. The compounded material used in this comparative example was ferrite (BSA 547 manufactured by Toda Kogyo Co., Ltd., particle size about 3 μm).
m), silane-based surface-treated ferrite (BS manufactured by Toda Kogyo Co., Ltd.
F547-B, particle size about 3 μm).

[0020]

EFFECTS OF THE INVENTION The core composition of the present invention can obtain a high tensile elongation by using a titanate-based coupling agent, and has a tensile strength about 10 times that of a conventional core composition for a coaxial cable for roadside communication. It has a high elongation rate and excellent damping characteristics. Therefore, since the core composition for a coaxial cable for roadside communication of the present invention has extremely good flexibility, it is easy to handle the core composition after it is manufactured into a cable using the core composition or when laying a cable. It is easy to install in a narrow space. Furthermore, it is possible to reduce the number of installation points of amplification relay points for recovering the transmission loss.

[Table 1]

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Claims (2)

[Claims] 1. A core for a coaxial cable for roadside communication, wherein 200 to 1000 parts by weight of ferrite and 0.1 to 100 parts by weight of a titanate coupling agent are mixed with 100 parts by weight of polyvinyl chloride. Composition. 2. The core composition for a coaxial cable for roadside communication according to claim 1, wherein the ferrite is surface-treated in advance with the titanate coupling agent.